CN108503003B - Rapid drying treatment process for sewage sludge based on microwave-polar medium substances - Google Patents
Rapid drying treatment process for sewage sludge based on microwave-polar medium substances Download PDFInfo
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- CN108503003B CN108503003B CN201810329939.0A CN201810329939A CN108503003B CN 108503003 B CN108503003 B CN 108503003B CN 201810329939 A CN201810329939 A CN 201810329939A CN 108503003 B CN108503003 B CN 108503003B
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
- C02F11/122—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering using filter presses
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Abstract
The invention discloses a rapid drying treatment process for sewage sludge based on microwave-polar medium substances, which comprises the steps of adding mixed slurry prepared from a mixed solvent prepared from a PAM organic polymer flocculant and a PAC inorganic polymer coagulant and a polar medium substance into sludge flocculation precipitation of wastewater containing sludge in a flocculation stirring tank, fully and uniformly mixing activated carbon powder and manganese dioxide polar medium substances with the sludge in the sludge flocculation process, finally uniformly distributing the sludge in precipitated water-containing sludge, carrying out filter pressing on the precipitated and flocculated water-containing sludge uniformly mixed with the polar medium substances by a belt filter press to form a sludge cake, and conveying the sludge cake into a microwave drying device by a conveyor belt for rapid drying. According to the invention, the polar medium is added into the sludge to improve the utilization efficiency of microwave energy, improve the heating rate, achieve the purpose of quickly drying the sludge, reduce the pollutant discharge in wastewater, reduce the sludge dewatering energy consumption by 40-50%, and improve the dewatering efficiency by more than 50%.
Description
Technical Field
The invention relates to the technical field of sewage sludge treatment, in particular to a rapid sewage sludge drying treatment process based on microwave-polar medium substances.
Background
In the sewage treatment process, the sludge treatment is always a concern for the industry. At present, sludge drying equipment mainly adopts mechanical dehydration and thermal dehydration, and main mechanical equipment comprises: rotary drum vacuum filter, rotary drum centrifuge, plate-and-frame filter press, belt filter press dehydrator, screw press dehydrator, leaf machine, sleeve machine or fluidized bed. In addition, the existing treatment methods for excess sludge in the sewage treatment process mainly comprise sanitary landfill, comprehensive utilization of land, heat treatment, sludge composting, ultrasonic sludge digestion and the like, and sludge dehydration is required before final treatment in order to facilitate transportation, storage, stacking and utilization of sludge. Therefore, a great deal of sludge with high water content has not only a great deal of inconvenience in the processes of storage, transportation, loading and unloading, etc., but also higher potential environmental safety risk and hidden danger, so the drying treatment of the sludge is imperative. The prior art discloses various technologies, for example, chinese patent publication No. CN102145974A discloses a method for treating sludge under normal conditions, which comprises adding an oxidation guiding agent and a regulator CaO into sludge, stirring, introducing ozone, adding a coagulation agent, and finally press-filtering the sludge. Although the method provided by the patent can decompose organic matters in the sludge, the obtained sludge still has a large specific resistance and is still not beneficial to the subsequent dehydration process. In addition, the existing sludge drying process method consumes energy in the thermal dehydration process, generates peculiar smell and even toxic and harmful smoke to cause air pollution.
In conclusion, a large amount of sludge is inevitably generated in the sewage treatment process, the defects of high energy consumption and large heat loss of the existing sludge dewatering and drying treatment methods are overcome, and the sludge is easy to form large lumps in the drying process, the contact area of the sludge and heat is small, and the drying rate is slow. How to treat a large amount of sludge generated in the sewage treatment process by harmless and quick drying becomes an important research topic in China at present.
Disclosure of Invention
Aiming at the defects of low microwave energy utilization rate and slow temperature rise of the conventional microwave sludge drying and dewatering process for drying sludge, the invention adds a polar medium into the sludge to improve the microwave energy utilization efficiency and the temperature rise rate so as to achieve the aim of quickly drying the sludge, and provides a sewage sludge quick drying treatment process based on a microwave-polar medium substance, which increases the density of sludge flocs in wastewater and improves the sludge drying efficiency, and comprises the following steps,
step S1: preparing slurry, namely preparing water, a PAM organic polymeric flocculant and a PAC inorganic polymeric coagulant into a mixed solvent, and adding a polar medium substance component into the mixed solvent to prepare slurry containing a polar medium substance;
step S2: quantitatively adding the slurry containing the polar medium substances prepared in the step 1 into the wastewater containing the sludge by using a quantitative pump, and fully stirring the slurry containing the polar medium substances in a flocculation stirring tank behind a secondary sedimentation tank in the wastewater treatment process to uniformly mix the slurry containing the polar medium substances with the wastewater containing the sludge in the flocculation stirring tank, wherein the mass concentration of the polar medium substances in the wastewater containing the sludge in the flocculation stirring tank is 0.01-1%;
step S3: performing pressure filtration on the sludge, namely performing pressure filtration on the sludge flocculated and precipitated in the flocculation stirring tank in the step S2 through a belt filter press to form a flat sludge cake;
step S4: drying the sludge, namely conveying the flat sludge cake formed by filter pressing of the belt filter press in the step S3 into microwave drying equipment for drying and dehydration, wherein the residence time of the sludge cake in a microwave drying cavity in the microwave drying equipment is 5-30 min, and the microwave frequency of the microwave drying equipment is controlled to be 433-2450 MHZ;
the polar medium substance comprises manganese dioxide powder and activated carbon powder.
In order to further realize the invention, the mass concentration of the PAM organic polymeric flocculant in the mixed solvent is 0.03-0.2%.
In order to further realize the invention, the mass concentration of the PAC inorganic polymer coagulant in the mixed solvent is 0.5-20%.
In order to further realize the invention, the mass concentration of the polar medium substance in the slurry containing the polar medium substance is 1-40%.
In order to further implement the present invention, the polar medium substance component in step S1 is added into the mixed solvent by a dry adding method or a wet adding method, so as to configure and prepare a slurry containing the polar medium substance.
In order to further realize the invention, the dry adding mode is to directly use a feeding device to add the polar medium material component into the water ejector and add the polar medium to the adding point through the water ejector.
In order to further realize the invention, the wet adding mode is that firstly the polar medium substance component is prepared into suspension containing the polar medium substance component, then the polar medium substance component containing the manganese dioxide powder and the activated carbon powder is mixed with water to prepare suspension containing the activated carbon powder with the mass fraction of 10%, and then the suspension containing the activated carbon powder is fully mixed with the mixed solvent through a slurry preparation system to prepare slurry containing the polar medium substance.
In order to further realize the invention, the slurry preparation system adopted in the wet adding mode comprises an adding device, a mixed solvent supplying system, a mixing tank and a stirrer.
In order to further realize the invention, the microwave drying equipment in the step S4 comprises a sludge conveying device, a microwave drying cavity, a microwave generator, a steam emptying device and a steam collecting device, wherein the sludge conveying device and the microwave generator are all arranged by adopting the prior art, the sludge conveying device and the microwave generator are both arranged in the microwave drying cavity, the steam emptying device is arranged above the microwave drying cavity, and the steam emptying device comprises an emptying pipeline and an exhaust fan connected with the emptying pipeline.
In order to further realize the invention, the thickness of the mud cake is 5 cm-15 cm.
The invention has the beneficial effects that:
1. aiming at the problems that the sludge in the wastewater is complex in components, usually presents a floccule shape with fine particles, has higher water content and higher viscosity, is difficult to settle and brings difficulty to the recovery and transportation of the sludge, the rapid drying treatment process of the sewage sludge based on the microwave-polar medium substance adds mixed slurry prepared by a PAM organic high polymer flocculant and a PAC inorganic high polymer coagulant into a mixed solvent and the polar medium substance in a flocculation stage, and due to the combination of the polar medium substance, the flocculating and precipitating rate of the sludge in the wastewater is accelerated, the wastewater purifying effect is improved, and the density of the sludge floccule is increased.
2. The method comprises the steps of adding mixed slurry prepared by a PAM organic polymeric flocculant and a PAC inorganic polymeric coagulant into a flocculation stirring tank to prepare a mixed solvent and polar medium substances in the process of sludge flocculation of wastewater containing sludge, fully and uniformly mixing activated carbon powder and manganese dioxide polar medium substances with sludge in the sludge flocculation process, finally uniformly distributing the mixture in precipitated water-containing sludge, carrying out filter pressing on the precipitated and flocculated water-containing sludge uniformly mixed with the polar medium substances by a belt filter press to form sludge cakes, and conveying the sludge cakes into microwave drying equipment by a conveyor belt to be quickly dried. According to the invention, the polar medium is added into the sludge, so that the sludge in the wastewater can achieve a better precipitation effect.
3. According to the rapid drying treatment process for sewage sludge based on the microwave-polar medium substance, disclosed by the invention, the polar medium is added into the sludge to improve the utilization efficiency of microwave energy, the heating rate is increased, and the purpose of rapidly drying the sludge is achieved. Compared with the conventional high-temperature heating and drying, the energy consumption of the invention is lower, and the exhaust fan of the steam emptying device is used as an air circulation system, thus increasing the air flow in the microwave drying cavity and discharging high-humidity air in time, being beneficial to drying sludge, improving the sludge treatment efficiency and saving energy, and the experimental result shows that compared with the conventional sludge heat drying, the energy consumption of sludge dehydration is reduced by about 40-50%, and the sludge dehydration efficiency is improved by more than 50%.
4. According to the microwave-polar medium substance-based sewage sludge rapid drying treatment process, the polar medium substance contains trace manganese dioxide powder, so that the activity of the PAM organic polymeric flocculant and the PAC inorganic polymeric coagulant is enhanced, the PAM organic polymeric flocculant and the PAC inorganic polymeric coagulant are favorable for rapid deposition of small molecular substances in products obtained by oxidation-reduction reaction of the PAM organic polymeric flocculant and the PAC inorganic polymeric coagulant in sewage, and the sludge flocs are reflocculated, so that the volume of the sludge flocs is increased, the specific resistance of the sludge is reduced, and the subsequent sludge dewatering process is favorably carried out.
5. The rapid drying treatment process for sewage sludge based on microwave-polar medium substances adopts microwave to heat and dry the sludge, has a sterilization effect, and can prevent the treated sewage sludge from causing secondary pollution to the environment. In addition, the sludge is filter-pressed into a flat mud cake with the thickness of 5 cm-15 cm by using a belt filter press, so that the sludge is heated more uniformly in the microwave drying equipment, and the drying efficiency is improved; the microwave drying device is characterized in that a steam emptying device is arranged above a microwave drying cavity of the microwave drying device and communicated with a steam collecting device, the steam collecting device adopts a spraying device, high-humidity waste gas generated in the microwave drying cavity is discharged, washed and recycled, on one hand, pollution is reduced, and on the other hand, the drying efficiency is improved. Compared with other heating modes, the microwave heating method disclosed by the invention utilizes a hot spot effect that polar medium substances quickly emit a large amount of heat under microwave excitation, so that the sludge is heated more uniformly, overcomes the defect that in the prior art, after the sludge is heated by microwaves due to high microwave transmission speed and high temperature rise, the evaporation effect is easily formed on the surface of the sludge due to high sludge moisture content, the negative temperature gradient which is not beneficial to quick drying of the sludge is caused due to low sludge surface temperature, and the temperature of the sludge surface and the temperature in the sludge are basically kept consistent, so that the evaporation of water is more beneficial, and the drying quick-acting rate is higher.
Detailed Description
The invention is further illustrated below with reference to specific examples.
The invention relates to a sewage sludge rapid drying treatment process based on microwave-polar medium substances, which comprises the following steps,
step S1: preparing slurry, (1) preparing water, a PAM organic polymeric flocculant and a PAC inorganic polymeric coagulant into a mixed solvent, wherein the mass concentration of the PAM organic polymeric flocculant in the mixed solvent is 0.03-0.2%, and the mass concentration of the PAC inorganic polymeric coagulant in the mixed solvent is 0.5-20%; (2) the polar medium substance component is added into the mixed solvent to prepare slurry containing the polar medium substance, wherein the mass concentration of the polar medium substance in the slurry containing the polar medium substance is 1-40%, and the polar medium substance component in this embodiment is manganese dioxide powder or activated carbon powder.
The polar medium substance component in the step S1 is added into the mixed solvent by a dry adding method or a wet adding method to prepare slurry containing the polar medium substance. When the polar medium substance component is added in a dry adding mode, the polar medium substance component is directly added into a water injector by using feeding equipment, and the polar medium is added into an adding point through the water injector; when the polar medium substance component is added by a wet method, the polar medium substance component is firstly prepared into suspension containing the polar medium substance component, then the polar medium substance component containing manganese dioxide powder and activated carbon powder is mixed with water to prepare suspension containing the activated carbon powder with the mass fraction of 10%, and then the suspension containing the activated carbon powder is fully mixed with a mixed solvent through a slurry preparation system to prepare slurry containing the polar medium substance;
the slurry preparation system adopted in the wet adding mode comprises an adding device, a mixed solvent supply system, a mixing tank and a stirrer, wherein the adding device, the mixed solvent supply system, the mixing tank and the stirrer are all realized by adopting the prior art, suspension containing polar medium substance components and the mixed solvent are respectively added into the mixing tank through the adding device and the mixed solvent supply system, and are fully stirred through the stirrer arranged in the mixing tank, so that slurry containing polar medium substances is formed after uniform mixing is achieved.
Step S2: and (2) quantitatively adding the slurry containing the polar medium substances prepared in the step (1) into the wastewater containing the sludge by using a quantitative pump, and fully stirring in a flocculation stirring tank behind a secondary sedimentation tank in the wastewater treatment process to uniformly mix the slurry containing the polar medium substances with the wastewater containing the sludge in the flocculation stirring tank so as to achieve a better flocculation effect and achieve the purpose of rapid flocculation and precipitation of the sludge in the wastewater containing the sludge in the flocculation stirring tank.
In step S2, the mass concentration of the polar medium substance in the wastewater containing sludge in the flocculation stirring tank is 0.01% to 1%, preferably 0.05%, that is, the mass ratio of the polar medium substance: PAM organic polymeric flocculant: PAC inorganic polymer coagulant: the wastewater was 5:1:100: 1000.
Step S3: and (5) performing pressure filtration on the sludge, namely performing pressure filtration on the sludge flocculated and precipitated in the flocculation stirring tank in the step S2 through a belt filter press to form a flat sludge cake, wherein the thickness of the sludge cake is 5-15 cm, so that the subsequent microwave rapid drying is facilitated.
The belt filter press in the step S3 is implemented by using the prior art, and includes a conveyor belt with a power driving device and a filter pressing device, the width of the conveyor belt is designed to be 1000mm, and the conveyor belt is connected between the sludge outlet of the filter pressing device and the inlet of the microwave drying device, so as to continuously convey the flat sludge cake formed by filter pressing of the belt filter press into the microwave drying device for drying.
Step S4: and (4) drying the sludge, namely sending the flat sludge cake formed by filter pressing of the belt filter press in the step S3 into a microwave drying device for drying, wherein the residence time of the sludge cake in a microwave drying cavity in the microwave drying device is 5-30 min, and the microwave frequency of the microwave drying device is controlled to be 433-2450 MHZ, preferably 915 MHZ.
The microwave drying equipment in the step S4 comprises a sludge conveying device, a microwave drying cavity, a microwave generator, a steam emptying device and a steam collecting device, wherein the sludge conveying device and the microwave generator are all arranged by adopting the prior art, the sludge conveying device and the microwave generator are all arranged in the microwave drying cavity, the steam emptying device is arranged above the microwave drying cavity and comprises an emptying pipeline and an exhaust fan connected with the emptying pipeline, so that waste gas with high humidity in the microwave drying cavity is timely extracted by the exhaust fan, and the sludge cake is quickly dried by the microwave generator. The steam collecting device is a spraying device in the prior art, the spraying device is communicated with the steam emptying device, and waste gas generated in the microwave drying cavity is washed by water and absorbed by the spraying device so as to reduce the pollution of the evaporated waste gas to the atmospheric environment.
Example 1
Adding slurry containing polar medium substances (manganese dioxide and activated carbon powder) into a flocculation stirring tank behind a secondary sedimentation tank in the domestic wastewater treatment process by using a quantitative pump, ensuring that the mass concentration of the polar medium substances (manganese dioxide and activated carbon powder) in the wastewater is 0.05%, performing flocculation precipitation on sewage in the flocculation stirring tank, performing pressure filtration on the sludge subjected to flocculation precipitation in the flocculation stirring tank into a flat sludge cake by using a belt filter press, and conveying the sludge into microwave drying equipment by using a 1000mm wide conveying belt; and (3) drying by using 915MHZ microwaves, simultaneously opening an exhaust fan, evacuating high-temperature moisture, and after 15min, reducing the water content of the sludge from 85% to 15%, wherein the drying rate is high.
Example 2:
adding slurry containing polar medium substances (manganese dioxide and activated carbon powder) into a coagulation stirring tank for electroplating wastewater by using a quantitative pump, ensuring that the mass concentration of the polar medium substances (manganese dioxide and activated carbon powder) in the wastewater is 0.08%, flocculating and precipitating sewage in the coagulation stirring tank for flocculation and electroplating wastewater, filter-pressing flocculated and precipitated sludge in the coagulation stirring tank for electroplating wastewater into a flat sludge cake by using a belt filter press, and conveying the flat sludge cake to a microwave drying device by using a 1000mm wide conveyor belt; and (3) drying by using 915MHZ microwaves, simultaneously opening an exhaust fan, evacuating high-temperature moisture, and after 10min, reducing the water content of the sludge from 75% to 15%, wherein the drying rate is high.
The above description is only a preferred embodiment of the present invention, the present invention is not limited to the above embodiment, and there may be some slight structural changes in the implementation, and if there are various changes or modifications to the present invention without departing from the spirit and scope of the present invention, and within the claims and equivalent technical scope of the present invention, the present invention is also intended to include those changes and modifications.
Claims (10)
1. A sewage sludge rapid drying treatment process based on microwave-polar medium substances is characterized by comprising the following steps:
step S1: preparing slurry, namely preparing water, a PAM organic polymeric flocculant and a PAC inorganic polymeric coagulant into a mixed solvent, and adding a polar medium substance component into the mixed solvent to prepare slurry containing a polar medium substance;
step S2: quantitatively adding the slurry containing the polar medium substances prepared in the step 1 into the wastewater containing the sludge by using a quantitative pump, and fully stirring the slurry in a flocculation stirring tank behind a secondary sedimentation tank in the wastewater treatment process to uniformly mix the slurry containing the polar medium substances with the wastewater containing the sludge in the flocculation stirring tank, wherein the mass concentration of the polar medium substances in the wastewater containing the sludge in the flocculation stirring tank is 0.01-1%;
step S3: performing pressure filtration on the sludge, namely performing pressure filtration on the sludge flocculated and precipitated in the flocculation stirring tank in the step S2 through a belt filter press to form a flat sludge cake;
step S4: drying the sludge, namely conveying the flat sludge cake formed by filter pressing of the belt filter press in the step S3 into microwave drying equipment for drying and dehydration, wherein the residence time of the sludge cake in a microwave drying cavity in the microwave drying equipment is 5-30 min, and the microwave frequency of the microwave drying equipment is controlled to be 433-2450 MHz;
the polar medium substance comprises manganese dioxide powder and activated carbon powder.
2. The microwave-polar medium substance-based sewage sludge rapid drying treatment process according to claim 1, characterized in that: the mass concentration of the PAM organic polymeric flocculant in the mixed solvent is 0.03-0.2%.
3. The microwave-polar medium substance-based sewage sludge rapid drying treatment process according to claim 1, characterized in that: the mass concentration of the PAC inorganic polymer coagulant in the mixed solvent is 0.5-20%.
4. The microwave-polar medium substance-based sewage sludge rapid drying treatment process according to claim 1, characterized in that: the mass concentration of the polar medium substance in the slurry containing the polar medium substance is 1-40%.
5. The microwave-polar medium substance-based sewage sludge rapid drying treatment process according to claim 1, characterized in that: and the polar medium substance component in the step S1 is added into the mixed solvent in a dry adding mode or a wet adding mode to prepare and prepare slurry containing the polar medium substance.
6. The microwave-polar medium substance-based sewage sludge rapid drying treatment process according to claim 5, characterized in that: the dry adding mode is that polar medium material components are directly added into a water injector by using a feeding device, and the polar medium is added into an adding point through the water injector.
7. The microwave-polar medium substance-based sewage sludge rapid drying treatment process according to claim 5, characterized in that: the wet adding method is that firstly, polar medium substance components containing manganese dioxide powder and activated carbon powder are mixed with water to prepare suspension containing the polar medium substance components with the mass concentration of 10%, and then the suspension containing the polar medium substance components is fully mixed with a mixed solvent through a slurry preparation system to prepare slurry containing the polar medium substances.
8. The microwave-polar medium substance-based sewage sludge rapid drying treatment process according to claim 7, characterized in that: the slurry preparation system adopted in the wet feeding mode comprises a feeder, a mixed solvent supply system, a mixing tank and a stirrer.
9. The microwave-polar medium substance-based sewage sludge rapid drying treatment process according to claim 1, characterized in that: the microwave drying equipment in step S4 includes sludge conveying device, microwave drying chamber, microwave generator, steam emptying device and steam collection device, and sludge conveying device and microwave generator setting all adopt prior art to realize, and sludge conveying device and microwave generator setting all set up in the microwave drying chamber, and the top in microwave drying chamber is equipped with steam emptying device, and steam emptying device includes evacuation pipeline and the air exhauster of being connected with evacuation pipeline.
10. The microwave-polar medium substance-based sewage sludge rapid drying treatment process according to claim 1, characterized in that: the thickness of the mud cake is 5 cm-15 cm.
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| CN110143749B (en) * | 2019-06-12 | 2022-01-28 | 江苏首标环保科技有限公司 | Microwave drying treatment device and treatment method for sludge in septic tank |
| CN110482823A (en) * | 2019-07-30 | 2019-11-22 | 陕西福天宝环保科技有限公司 | A kind of flash baking method of electroplating sludge |
| CN112919750A (en) * | 2019-12-06 | 2021-06-08 | 四川大学 | Method for treating excess sludge by microwave coupling manganese dioxide |
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| CN102827661A (en) * | 2012-08-31 | 2012-12-19 | 燕山大学 | Sludge fuelization treatment process of urban sewage treatment plant |
| CN104556630A (en) * | 2014-01-06 | 2015-04-29 | 嘉兴市世纪今典景观工程有限公司 | Technology for micro-wave treatment of sewage sludge |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102827661A (en) * | 2012-08-31 | 2012-12-19 | 燕山大学 | Sludge fuelization treatment process of urban sewage treatment plant |
| CN104556630A (en) * | 2014-01-06 | 2015-04-29 | 嘉兴市世纪今典景观工程有限公司 | Technology for micro-wave treatment of sewage sludge |
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